Incandescent electric lamp.



G. O. WILLEY.

INCANDESCENT ELECTRIC LAMP.

APPLICATION FILED MAY 24.1917.

Patented Feb. 4, 191$).

VEN 712 52%, a, MZMJ /ZM AT? Y's 1 1 w 5 h /l cluster, the lamp being of SATES GEORGE O. WILLEY, OF

INCANDESCEN'L Application illed May 24.

United States, residing at Lynn, in the county of Essex and tate 0 Massachusetts, have invented new and useiullmprovements in Incandescent Electric Lamps, of which the following is a specification.

This invention is embodied in an incandescent electric lamp adapted to be used either singly, or as a unit of a group or simple construction and comprising a single length of tungsten wire which includes an incandescing portion and leading-in end portions inte' a1 therewith, a glass tube forming a cham-- er inclosing the incandescing portion 0 the wire and contracted at its ends to form nipples which are closed on ortions of said wire, and conducting caps or bases mounted on said nipples an in electrical connection with the leading-in,

ortlons of the wire. Of the accompanying drawings forming a part of this specification, I Figure 1 is a longitudinal section of a lam embodying my invention.

Fig.2 is a perspective view of organized to support a group structed as shown by Fig. 1

.Fig. 3 is a perspective view showing the lamps assemble a holder holder and a group of thereon.

Fig. 4 is a section on line 4-4: of Fig. 3. Fig. 5 is a perspec ive diagram, showing the filaments and electrical connections between the same. Fig. 6 PBISPBOHVQ view, portion of the tube represented by before its ends are contracte Fig. 7 1s a fragm sectionalview,

Fig. 1,

entary showing portions of two lamps arrange in tandem order.

same reference characters indicate parts in all of the figures.

drawings, 12 represents a single length of tungsten wire, which is substantially straight, although it may have a helical portion 12. 13 represents tube The the same In th straight glass preferably cylin hermetically closed at its opposite ends on t e endpor-. tions of the wire 12, said tube as here shown, having contracted end port'ons 13* forming pples which are hermetically closed upon the end portions of the wire 12. The hola substantially drical,

- Specification of Letters Patent.

with conducting means, so

the leading-m of lamps conshowing a LYNN, MASSACHUSETTS.

ELECTRIC LAMP.

1917. Serial No. 110.575.

' Patented Feb. 4., 1919.

low portion of the tube 13 forms a chamber inclosmg the main portion of the wire. Said main portion constitutes the incandescing portion of the wire, an the end portions of the wire extending through and protected by the nipples 13, constitute -leadingin portions integral with the incandescing portion.

The said leading-in portions are connected that when the lamp is installed in a su'table holder, it forms a part or resistance member of an constituting bstitute for an incandescing filament and leading-in wires rately from In the embodiment of the invention here shown, the leading-inportions of the wire 12 are electrically connected with conducting terminals or bases 14 formed as caps, ap- "plied to the nipples 13. The number 0 arts is reduced to the minimum because the incandescing and leading-in portions are integral with each other. Tungsten wire is adapted to withstand a temperature of above 3200 F. without melting, hence the incandescing portion is not liab e to break away from the protected leading-in portions when the incandescing portion is raised to any temperature suitable for illumination. Figs. 2, 3 and 4 illustrate a means for separably engaging tions of the lamp to support the latter, sai holder being provided with electrical-connections adapted to a circuit through the wire 12, the holder in this instance'heing adapted to support a group or cluster of lamps, eachcontracted as described. While the holder may be made in a variety of forms, I have for purposes of illustration, shown it as composed of two heads 16 and 17, which are spaced apart and connected by a rodv 18, which is a conductor. of electricity.

The head resilient clips 20, series of resilient clips 21, electrical conductors and adapted to both mechanically and electrically engage the lamp termina s or bases 14. a

The electrical connections with which the holder is provided include conducting wires 22 connecting two of the clips 20, a similar wire 23 connecting two other clips 20, and a homer having the end potthese clips being 13 being connected by a terposed between the heads conducting Wire 24 connecting with another clip 20 and forming one of the circuit terminals, plug 25 attached tothe head 16 and adapted to engage a fixed lamp socket.

The said electrical connections also includea conducting wire 27 connecting two of the clips 21, a conducting wire 28 connecting tWo other clips 21, and a conducting wire 29 connecting the remaining clip 21 with the conducting rod 18. The conductor formed by said rod may extend into the plug 25 to constitute the other circuit terminal, or, as

here shown, ducting wire terminal.

It will now be seen that when the lam units are engaged with the clips 20 and 21, and the plug 25 is engaged with a lamp socket, the wires 12 of the group or-cluster of lamps are connected in series. It is obvious', however, that the holder may be constructed and adapted to support and com plete the circuit through one lamp, instead of a group or cluster.

As showniby Figs. 3 and 4, the holder may be provided with a reflector 32, for each lamp, said reflector facing the inner side of the lamp and being formed and arranged to may be provided with a con- 30 constituting the last-named The series of reparts of a fluted tube in- 16 and 17.

As shown by Fig. 7 a plurality of lamps may be arranged in tan neck 13 formed by "acontracting a portion'of the tube as origiextending through both nally formed upon a portion of a wire 12 tubes.

vantages resulting from the or lamp unit construction The many ad improved lamp above described will be readily apparent to dem ,order, the tubes those skilled in the art, without further description.

The helically coiled portion of the wire may extend continuously from one of the tube, or in a gas-lamp, the'tube containing any suitablerare gas such as nitrogen, ar-' gon, etc.

I claim:

1. A cluster lamp comprising a plug member having an enlarged head, a second head substantially corresponding to'the first head and held spaced therefrom by a connecting rod, a plurality of resilient clips arranged around the edges of the heads, a plurality of lamp units adapted to have their ends engage with the clips on said heads, and a plurality of reflectors between said heads and behind said units.

25A cluster lamp comprising a holder consisting of two heads held in spaced relatlon by a rod secured at the center of the heads, one of said heads having a threaded plug rising from the outer face thereof, a plurality'of a'rcu-ate reflectors disposed between the heads adjacent the edges thereof and arranged edge to edge with their concaved faces exposed, a plurality of resilient clips secured to the edges of the head, and a plurality of lamp units adapted to extend longitudinally of the holder and having their opposite ends engaging with the resilient clips on the heads, each of said units being arranged before one of said reflectors.

, n testimony whereof I have aflixed my signature.

GEORGE O. WILLEY. 

